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To: SilentZ who wrote (65376)12/10/2001 7:23:39 PM
From: Bill JacksonRespond to of 275872
 
-Z,What he says is essentially correct. Think of defects like pepper sprinkled on the wafer. A larger die will have a greater chance of finding a defect on it, thus fewer will be good.

Now the fight against defects is constant and ongoing, and with tine the line gets better and better as they eliminate the defect root causes. I would expect a mature P-III line to have fewer defects than a newer p-IV line. In addition as the features get smaller they become less tolerant of the 'pepper' on the die.

Smaller features help as the number of dice that will not hit a defect is greater...as long as the smaller features result in a smaller final die.
In this case the P-IV is 40% larger than the P-III.
When they get to .13 this cause will vanish, however other defect sources will crawl out of the woodwork.

Bill



To: SilentZ who wrote (65376)12/10/2001 8:12:22 PM
From: fyodor_Respond to of 275872
 
Z: Wouldn't that just apply to the same chip on the same process? I mean, P4 could be on a better process than PIII and thus have better yields, no?

That's unlikely. Intel follows a principle of Copy Exactly! There have been a few low-volume departures from this strategy of late, but basically it means that Intel takes their newly developed, well-yielding process and copies it EXACTLY! to all its other fabs.

For more information about this, you can do a quick search for "copy exactly" on Intel's site.

-fyo



To: SilentZ who wrote (65376)12/10/2001 10:39:00 PM
From: Joe NYCRead Replies (1) | Respond to of 275872
 
Z,

Wouldn't that just apply to the same chip on the same process? I mean, P4 could be on a better process than PIII and thus have better yields, no?

Piii and P4 are currently on the same process. And Northwood will be on the same process as Tualatin. But there are number of other variables within the same process that can be tweaked, which can influence yields (but these are a bit over my head, so I will not get to them).

Joe


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